30689 has 2 divisors, whose sum is σ = 30690. Its totient is φ = 30688.

The previous prime is 30677. The next prime is 30697. The reversal of 30689 is 98603.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30625 + 64 = 175^2 + 8^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30689 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15344 + 15345.

It is an arithmetic number, because the mean of its divisors is an integer number (15345).

2³⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

30689 is a deficient number, since it is larger than the sum of its proper divisors (1).

30689 is an equidigital number, since it uses as much as digits as its factorization.

30689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 30689 is about 175.1827617090. The cubic root of 30689 is about 31.3084027837.

The spelling of 30689 in words is "thirty thousand, six hundred eighty-nine".